With former state Rep. Tootie Smith also leading Commissioner Jamie Damon in the Position 4 race, control of the county board could revert to Republicans for the first time since 2006.

Ludlow and Smith are Republicans, who could join with current Commissioner Paul Savas to form a new majority. Lehan and Damon are Democrats. Board positions are technically nonpartisan.

Tonight's results come amid a state investigation into possible ballot tampering by a temporary elections employee, who allegedly filled in down-ballot races left blank to cast additional votes for Republicans. Six ballots that were potentially altered had been identified as of Tuesday afternoon, with an unknown number of additional ballots under review, Oregon Secretary of State Kate Brown said.

"For all potentially altered ballots, Clackamas County elections officials will determine whether or not the original voter intent can be established," said Brown, contradicting statements from county officials. "If the original voter intent can be established, the ballot will be counted to reflect what the original voter marked."